Sorry for gap but have been away for a week in caravan. For a change was watching stonechats, whitethroats and skylarks. Now back home and think there may be 2 eggs in the nest now. One swift is on the nest almost constantly now so I will not be able to check it out in person but if you look closely to the first video, on the left hand side it looks like 2 eggs present. Not sure what this means. Checking reports around the country most swifts have hatched. With an incubation period of 19-27 days and a fledgling period of 27-56 days if this egg hatches it will be at least the last week of August before it fledges. This I think will be very late so not sure what will happen.

Video showing 2 eggs clearly.

A short video showing typical late evening behaviour.